Improvement in power-presses



UNITED STATES CHARLES W. JOHNSON, OF

PATENT Orjrce.

WATERBURY, CONNECTICUT.

Specification forming part of Letters Patent No. 50,826, dated November 7, 1865.

To all whom it may concern:

Be it known that I, GHAaLEs W. J onNsoN, of Vaterbury, in the county of New Haven and State of Connectieut,have invented a new and useful Improvement in Power-Presses; and I do hereby declare the following to be a full, clear, and exact description of the same, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, and which said drawings con- .stitute part of this specification, and represent, 1n-

Figure 1, a front view; Fig. 2, a side view, partial section; Figs. 3, 4, 5, and 6, diagrams to illustrate the movement of the slide, and Figs. 7, 8, and 9, detached views to illustrate the operation of the clutch.

Similar letters indicate like parts.

My. invention relates to an improvement in machines for punching, cutting, Src., commonly calledpower-presses;77 and it consists in a mechanism for operatingthe slide, whereby the upward movement of the slide is made in much less time than the downstroke, by which irnprovement so much time is saved in each full movement of the slide as the npstroke is quicker than the downstroke; also, in the arrangement of a clutch-bolt, whereby the power is detached when the slide is at its highest elevation, and by theoperation of which the power maybe detached atevery full movement of the slide.

To enable others skilled in the art to make and use my invention, I will proceed to describe the construction of the same.

A is the bed-plate; B, the frame supporting in proper guides, C C, the slide D.

E is the drivin g-shaft supported in bearings F F; G, the pulley or ily-wheel, to which power is applied to drive the press in the usual manner.

X is the punch, and Y the die holder.

To the inner end of the driving-shaft I tix a pinion, H, which works into a gear, I. The said gear I is double the diameter of the pinion andrevolves on a fixed bearin g, K. Through the said fixed bearing K, and above its center, in a perpendicular line I insert a spindle, L, (see Fig. 2,) to which I fix a plate, P. The spindle and plate revolvefreelyin the bearing, and are turned by a pin or stud, ,ou the gear I, working in a slot, c, in the plate P, (see Fig.

2,) so that as the gear revolves the plate and spindle turn with it, but each, the plate and gear, on their respect-ive centers, the pin or stud a moving in the slot c, toward or from the center of the plate as the radial line from the center of the plate to the pin decreases or of the center of motion of the plate relatively to the center of the gear. Outside the plate M, connects with the slide D. As the said plate is made to revolve, as before described, its connection with the slide D will move the slide up and down at each revolution. This completes the construction ot' the first part ot' my invention, and to fully illustrate its operation I introduce Figs. 3, 4, 5, and 6, which are diagrams illustrating the movementand showing the crank-pin din its fourpositions, up, half down, down, and half up.

I represent the plate P, with its crank-pin d and slot c and spindle L, in black, the gear I, with its stud a, in red, and the fixed bearing K, around which the gearI revolves, in blue. In Fig. 1 the plate P is represented as in the position when the crank-pin dis up. The slide D is, of course, in acorresponding position. The slot c in the plate is formed at right angles to pin d and center of the plate P. The pin aon the gear I works in the slot c, as before described. In performing the tirst fourth part of a revolution of ,the plate in the direction denoted by arrow or from the position in Fig. 3 to that in Fig. 4, the pin a, which moves the plate P, in consequence of the eccentricity ot' center of the plate to the center of the gear, will have passed to the most distant part of the slot c, and will also have passed through considerable :more than one-fourth part ot' its revolution, (about one-third,) as denoted by the radial lines. Continuing through a second fourth part of arevolution,or from the position denoted in Fig. 4 to that in Fig. 5, carries the pin d, and consequently the slide, to its lowest point, and the pin a will have passed through a like portion ofitsrevolution,(aboutone lhird,) as in the first fourth, and will also have traversed back in the slot c to the same position as at starting, the third-fourth part of a revolution of the plateP; or from the position in Fig. 5 to that in Fig. 6, the pin awill have traversed down to the inner extremity of the slot o, and

increases in consequence of the eccentricity P, I iX a crank pin, d, from which a pitman, l

ot' thegear moves the plate Ponehalf its revo-4 1ut-ion,or from highest to lowest point, the other third onlyis occupied in turningthe plate its other half-revolution, or from lowestto highest point. In common presses both movements are alike; therefore by my invention twenty-five per cent. of time is saved in each operation. By reversing or placing the pin d on the opposite side of the center of the plate the rapid stroke would be down and slow stroke up.

The pin d may be adj ustably attached to the plate, so as to increase or decrease the length of stroke of the slide, and the difference oftime in the up or down stroke will be in proportion as the spndleLis placed nearer or farther from the center of the gear. Goncentric, of course, they will revolve in like time. The farther from the center of the gear the spindle is set the greater will be the variation, provided always that the center ofthe spindle must come within the circle described by the pin t on the gear.

To connect or disconnect the power which forms the second part of my invention the pulley E, which drives the machine, is fitted s0 as to turn loosely on the shaft G. I form a groove in the shaft, into which I fit a bolt, r,

f so as to slide freely therein, making the bolt thicker than the depth of the groove, so as to project above the shaft, and when the bolt is moved or set into anotch, a, in the hub ofthe pulley, as in Fig. 2,the shaft will revolve with thepulley, and when the bolt is drawn out from/.the notch the pulley will revolve while the shaft stands still.

To operate the bolt I hang a lever, N, on a fulcrum, s, (see Fig. 1,) upon which, and directly under the shaft E, I vform a projection,

p, and also form a notch, x, in thebolt r. (See Figs. S and 9.) The lever is represented in Fig. 7, in black, as down to connect the power, and in red as up to disconnect the power. IVhen down, as 'in black, the shaft will revolve and the bolt clear the projection p on the lever, as in Fig. 8. A spring, j', forces the bolt into the notch of the pulley; but when the lever is allowed to rise, as in red,the notch o n the bolt will catch upon the projection p ot' the lever (the said projections made inclined upon its side for the purpose) and draw the bolt from the pulley to release the power. 'Ihe lever, when at rest, is held up by spring, or otherwise, to hold the 'bolt back, so that when it is desired to connect the power draw down the lever, as in black, and also in Fig. 3. To insure the disconnection at the time when the slide is up I fix a cam, S, to the spindle L of the plate, to revolve with it, of the form nearly as shown in Fig. 7 in black or red. The spindle revolvesonce whilev the shaft revolves twice. The cam, in red, stands in the position as when the slide is up, and the lever can rise high enough, asalso in red, to engage in the bolt and hold it back. To operate the press drawdown the lever from the position in red to that in black. The bolt, being disengaged, flies into the notch in the pulley to engage the power, as described. This forces the slide down. The cam will stand as in black, Fig. 7, andl prevent the lever from rising until the slide has been carried up and the cam again in the position shown in red, at which point the lever can rise and disconnect the power. rJhus, unless the lever is held down, the bolt cannot engage the power, excepting on the upward movement of the slide. lf more than one operation of the slide is required, the lever ymust be held away accordingly by the oper- CHARLES W. JOHNSON.

IVitnesses:

J oHN E. EARLE, RUFUs SANFORD. 

